256403559280 has 60 divisors (see below), whose sum is σ = 655259451336. Its totient is φ = 93237654400.

The previous prime is 256403559277. The next prime is 256403559289. The reversal of 256403559280 is 82955304652.

It is a super-2 number, since 2×256403559280² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256403559289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13234306 + ... + 13253665.

Almost surely, 2^256403559280 is an apocalyptic number.

256403559280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256403559280 is an abundant number, since it is smaller than the sum of its proper divisors (398855892056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256403559280 is a wasteful number, since it uses less digits than its factorization.

256403559280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26488006 (or 26487989 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 256403559280 in words is "two hundred fifty-six billion, four hundred three million, five hundred fifty-nine thousand, two hundred eighty".